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• W3099490060 abstract "It has recently been shown that, in the vicinity of their event horizons, black holes exhibit an infinite-dimensional symmetry. This symmetry captures relevant physical information about the black hole, and in particular about its thermodynamics. Here, we show that the same holds in a cosmological setup. More precisely, we show that around the de Sitter cosmological horizon, an infinite set of diffeomorphisms preserving a sensible set of boundary conditions emerges. These boundary conditions are similar to those considered by Price and Thorne in the context of the membrane paradigm, and permit to accommodate interesting gravity solutions. As for other boundary conditions considered previously, they are preserved by an infinite-dimensional asymptotic isometry algebra that includes supertranslations and two copies of the Virasoro algebra. This symmetry has associated a set of Noether charges that turn out to be conserved, finite, and integrable. We derive these charges explicitly using the covariant formalism and analyze their physical meaning by evaluating them to the case of de Sitter space. In this case, the zero-mode of the charge is found to account for the Gibbons-Hawking entropy of the cosmological horizon. We then consider a much more general set of solutions, including asymptotically de-Sitter black holes and asymptotically Taub-NUT-de Sitter black holes." @default.
• W3099490060 created "2020-11-23" @default.
• W3099490060 creator A5014489850 @default.
• W3099490060 creator A5029247609 @default.
• W3099490060 date "2019-07-23" @default.
• W3099490060 modified "2023-10-08" @default.
• W3099490060 title "Cosmological horizons, Noether charges and entropy" @default.
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• W3099490060 doi "https://doi.org/10.1088/1361-6382/ab2e42" @default.
• W3099490060 hasPublicationYear "2019" @default.
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